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Date: Mon, 29 Mar 2010 09:47:29 -0700 From: Rick Jones <rick.jones2@...com> To: michal.simek@...alogix.com CC: LKML <linux-kernel@...r.kernel.org>, John Williams <john.williams@...alogix.com>, netdev@...r.kernel.org, Grant Likely <grant.likely@...retlab.ca>, John Linn <John.Linn@...inx.com>, "Steven J. Magnani" <steve@...idescorp.com>, Arnd Bergmann <arnd@...db.de>, akpm@...ux-foundation.org Subject: Re: Network performance - iperf I don't know how to set fixed socket buffer sizes in iperf, if you were running netperf though I would suggest fixing the socket buffer sizes with the test-specific -s (affects local) and -S (affects remote) options: netperf -t TCP_STREAM -H <remote> -l 30 -- -s 32K -S 32K -m 32K to test the hypothesis that the autotuning of the socket buffers/window size is allowing the windows to grow in the larger memory cases beyond what the TLB in your processor is comfortable with. Particularly if you didn't see much degredation as RAM is increased on something like: netperf -t TCP_RR -H <remote> -l 30 -- -r 1 which is a simple request/response test that will never try to have more than one packet in flight at a time, regardless of how large the window gets. happy benchmarking, rick jones http://www.netperf.org/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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